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v3.25.0.1

Nature of Operations and Significant Accounting Policies - Other Various Policies (Details) | 12 Months Ended
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Dec. 31, 2024
Long-Term Debt |
Minimum maturity period at date of issuance for debt to be classified as long-term | 1 year

X
- Definition Represents the minimum number of years for the maturity date debt when issued for it to be included in long-term debt. + References No definition available. + Details
Name: | pfg_LongTermDebtMinimumMaturityPeriod
Namespace Prefix: | pfg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LongTermDebtNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration